Centrifugal spinning device



July 20, 1931. H, BYRON 2,087,467

CENTRIFUGAL SPINNING DEVICE Filed July 30, 1934 17 777017103 ff Byron Patented July 20, .1937

UNITED STATES PATENT OFFICE CENTRIFUGAL SPINNING DEVICE Thomas-H. Byron, Elizabethton, Tenn., assignmto North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application July 30, 1934, Serial No. 737,499

3 Claims. (01. DIV-27.5)

1 filaments thus formed are drawn therethrough and passed to a spinning pot which simultaneously twists and collects the yarn.

The resulting yarn body of the spinning pot process is built up from outside to inside and when finished has the form of a dough-nut with a rectangular cross-section. This cake of yarn must be given difierent after-treatments such as desulphurizing or decopping, deacidifying, 'etc.

Due to its structure it has been the practice to use 0 inserts, such as resilient collars, for the purpose of reinforcing the unsupported yarn body during the different treatment steps. Even then the yarn body was not sufliciently supported and a loss was suffered fromlcollapsed cakes or tangled yam layers.

In view of the foregoing, it is readily apparent that the less handling the spinning cakes receive the less resulting loss there will be through damaged cakes.

After the wet-treatment of the cakes, they must be dried. It is during the drying step that inequalities in the yarn take place, due to uneven shrinkage. It has therefore been thepractice to overcome this disadvantage by rewinding the yarn. By so doing an additional step is necessary which increases the production cost.

It is'therefore one object of the present invention to lower the cost of production while improving the quality of the yarn.

Another object of. the present invention is to produce pot-spun yarn or filaments in a continuous process. 1 e

A further object of the present invention is to.

so produce pot-spun yarn that ;a twisted, treated and evenly dried product is obtained with a mini-.

mum of steps.

These and other objects will in part become obvious and in part be pointed out in the following specification and claims whentaken in conjunction with the attached drawinghwhich:

Figure I is a diagrammatic, side elevationof one form of the invention.

Figure II'is an enlarged cross-sectional view of my container for the drying of pot-spun yarn which has not already been dried.

Figure HI isza detailed cross-sectional view of the cover used with the container shown in Figure l1. 7

In the drawing in which like numerals of reference indicate like parts, and referring specifically to Figure I of the drawing, l indicates the yarn or filament bundle which is extruded from the spinneret 2, located below the surface of a precipitating bath 3.

The filaments are drawn upwardly by the roller 5, over a guide roller 4. The drawing roller'5 rotates in a desulphurizing or decopping bath 6 in the trough I. A flowing bath arrangement (not shown) may be employed at this point, with the bath flowing over the entire surface of the roller 5 and being drained near the top of the trough I.

From-the drawing roller 5 the yarn is led to the second roller 8, rotating, for example, in a washing bath 9 contained in the trough III. This roller 8 and trough It may also have applied the flowing bath arrangement described with respect to the first roller 5. Further, should the type of yarn being treated require more than two baths, these may be added without altering the scope of the present invention.

From the roller 8 the yarn is led over the roller guide II and then downwardly to the collecting pot l5. On the way downward the yarn passes through a heating tube l2, having perforations shown at l3. Here warm air or other drying medium is applied to the traveling yarn. The filaments finally pass, through the ordinary reciprocating guide indicated by ,to form the cake |6.' In operation the roller 8 may revolve at a faster rate of speed than the take-up roller 5, thereby stretching the yarn. A'further advantage lies in the fact that by rotating the roller 8 at a faster speed than the speed of the take-up in the pot IS the yarn will be under no appreciable tension when passing through the drying tube l2 and will therefore be able to shrink freely.

The yarn thus wet treated and partially dried is collected in the pot l5. In Figures II and III I have shown a means for drying the yarn thus produced so that no outside-inside shrinkage difflculties occur. The pot I5 is perforated in the bottom portion at l1 and,,.after collection, a top l8'is applied to the cake. This top l8 comprises a non-foraminous ring provided with a gasket [9,

and the ring and gasket are so sized that they snugly fit the inner perpendicular surface face of the pot 15. A drying medium is passed upthrough theoriflce 20 in the ring l8. Thus, the top, bottom and sides of the cake are sealed from the actionpi' the drying medium, and the cake I 6 is driedfrom the inside only.

In Figure III I have shown a detailed view of the ring l8, and a particular soft gasket I! with a hollow space 2| is described. This gasket arrangement will be found to be sufliciently rigid to produce a fluid tight seal for the top of the cake i6, and will also be adapted to sink with the cake should it shrink in size longitudinally during the drying step.

The ring it may be of bakelite, hard rubbe non-corrodible metal, or other material not acted upon by the yarn.

Having now set forth my invention as required by the patent statutes, what I desire to claim is: 1. A mechanism for drying yarn so that shrinkage diflerences are eliminated, comprising, in combination, a spinning pot with imperiorate walls and bottom at those points contacting with the cake built up therein, perforations in the middle portion of the bottom not so contacted, and an imperforate ring-like cover for the pot, the imperforate portion being so designed as to seal the top edge of a spun cake, and the cover so constructed that it is able to form a fluid tight covering for the cake top, yet maintain its contact therewith ii the cahe should longitudinally shrink, during its 1 7 8.

2. A device for drying yarn so that shrinkage differences are eliminated, comprising, in combination, a spinning pot having a side wall and bottom for contacting a cake built up therein, and a cover for said not adapted to rest on the top of the spun cake, said cover being so constructed and arranged at its outer periphery as to form a fluid tight seal with the side wall of said pot yet slidable whereby should the cake shrink longitudinally during the drying thereoi. the said cover will maintain contact with the cake.

3. A device for drying yarn so that shrinkage diiIerences are eliminated, comprising, in combination, a spinning pot having a side wall and bottom for contacting a cake built up therein, and an imperforate cover adapted to rest on the top 01 the spun cake, said cover having an opening in the center of that portion which is not in contact with the cake, means formed at the outer periphery of said cover to eiIect a fluid-tight seal with the side wall of said pot, said means adapted to allow the cover to slide along the side wall of said pot whereby should the cake shrink longitudinally during the drying thereof the cover will maintain contact with the cake.

THOMAS H. BYRQN. 

